Grease gun



June 23, 1925. 1,543,505

C. H. MIDDLETON ET AL GREASE GUN Filed May 23, 1921 (IZZMi/iQZ/Zwz as 131 o Patented June 23, 1925.

UNITED STATES I CHARLES H. JVIIIDZDLII'ITON- AND HARRY A. SELSER, OFCAMDEN. NEW JERSEY.

unease GUN.

Application filed lay 2a,

ToaZZ whom it may concern. I

Be itknown that we, CHARLES H. MIDDLE- row and HARRY A. Sunsnn, citizensof the United States, residing at Camden, in the county of Camden andState of New Jersey, have inventeda new and useful Grease Gun, of whichthe following isa specification.

The object of this inventionis the pro vision --ot' a piston of new andimproved form.

In the accompanying drawings Figure 1 shows in side elevation,,a greasegun wherein the invention is used; Figure 2 is a longitudinal sectionwherein :parts appear in section; Figure 3 isa sectional view showng oneform of piston; Figure 4 is a sectional detail illustrating a modifiedform of piston.

The grease gun shown in Figures 1, 2 and 3, includes a barrel 1comprising a body 2, a rear cap 3 threaded onthe body, and a front cap 4threaded on the body, the rear cap having a neck 5, and the front caphaving a neck 6. A nozzle 7 of any desired form is threaded into orsecured otherwise to, the neck 6 of the front cap 4.

A plunger 8 is threaded at 9 into the rear cap 3 and the neck thereof. Asocket 10 is mounted on the rear end of the plunger 8 and is heldthereto by a securing element 11, the socket having a longitudinal slot12. The numeral 14 designates, generally, a handle including an arm 15and a grip 16 at right angles to the arm, the grip being attached to thearm by asecuring member 17. One end of the arm 15 is received in theslot 12 of the socketlO and is connected to the socket by a pivotelement 18, the construction being such that'the arm 15 may be disposedat adjusted'angles with respect to the plunger 8. l/Vithinthe body 2 ofthe barrel 1, the plunger rod 8-carries an abutment 19, which maybe inthe form of a-nut, thread ed for adjustment on the socket.

The piston portionof the gun may-be constructed in various ways withoutdeparting from the spirit'of the invention. As shown in Figure 3, thepiston 20 includes a body 21 threaded on the plunger 8 and held againstrotation by the abutment 19, the abutment serving as a lock nut. Apacking disk 22 is mounted on the plunger Sand engages the body 21 ofthe piston, the ackin-g disk having a forwardly presented 'fiang e 2 3,cooperating with the body 2 of-the barrel 1 The 1921. sum No. 471,670.

packing disk may be made out of any suitable material, such, forinstance, as leather. A frusto-conical expander 24 is carried by theplunger 8 and engages the flange 23 of the packing disk22 to force theflange against the body 20f the barrel. A castle vnut 25 is threaded onthe plunger 8 and en- .gages the'expander 24 to advance theexpander-with respect to the flange 23 of the disk 22, the castle nutbeing held in place by a cotter pin 26 mounted in the plunger 8.

The body 2 of the barrel 1 may be provided in its interior with aprojection adapted to cooperate with the piston 20 in a way which willbe described hereinafter.

The particular way in which the gun is to be manipulated will dependupon the taste and desires of the user upon the consistency of thegrease, and upon other conditions. It may be desirable to remove therear cap 3 and to remove the front cap 4,

under which circumstances, theplunger 8 and the piston 20 may be drawnbackward rapidly, the grease being sucked into the forward end of thebody 2 by the piston 20. Then, the caps 3 and 4 may be replaced and thegrease may be fed outwardly through the nozzle 7 slowly, by rotating theplunger 8 through the instrumentality of the handle 14, the plunger andthe piston 20 advancing, because the plunger is threaded at 9 into theneck 5 of the cap 3. It is clear that, if

desired, backward movement of the plunger 8 to suck in the grease, maybe brought about by rotating the plunger, rather than by removing therear cap 3, if desired. Further, the front cap 4 may or may not beremoved, depending upon the consistency of the grease. If, as is usuallythe case, a heavy dope is employed, the nozzle and the cap 4 will beremoved. When the plunger 8 is rotatedby the handle 14, the arm 15 ofthe handle may stand at right angles to the plunger, as shown in Figure1, or the arm may be brought more or less into alinement with theplunger, depending upon the amount of space in which the operator has towork.

on the plunger 8". A compressible, resilthe body 2 of the barrel.

- held thereon by a cotter pin 35.

ient, outwardly convexed packing ring 29 is located between the disks 27and 28 and engages the inner wall of the body 2 of the barrel. A packingdisk 30 is located on the plunger 8 and enga es the disk 28, the packingdisk having a irwardly extended flange 31 hearing against the innersurface of the body 2 of the barrel. A split expansion rin 32 is locatedwithin the flange 31 and ten s to press the same outwardly against Thepacking disk 30 is engaged by a retaining plate 33 carried by theplunger 8 and engaged by a castle nut 34 threaded on the plunger and Byadvancing the castle nut 34, the disk 28 will be advanced toward thedisk 27, the packin and the barrel 2 will result. The castle nut 34,coactigg serves to the disk 28.

disk.

ring 29 will be bowed outwardly, and a tight contact between the packingringwith the retaining plate 33, 1nd the packing disk 30 againstReverting to Figure 2, it will be understood that 1f the cap 3 isremoved, and if the piston 20 is'drawn 'ba'ckwardly'g the projection 50,cooperating with the body 21 of the piston, will prevent the iston frombeing withdrawn from the y 2 of the barrel.

I claim y In a piston, a plunger; an abutment on the plunger; disksmounted on the plunger, one disk engaging the abutment; an outwardlybowed packingring located between the disks; and means'for advancing theother signatures in the presence of two witnesses.

CHARLES H. MIDDLETON. a I HARRY A. SELSER. Witnesses:

"1 \VM. A. Onaunnnmm Jorm A. WERNER.

that we claim the forego

